Thanks for getting on touch. Presuming Joyce, and not, say, Francis Bacon, to have been the author of James Joyce's literary works, the answer is a 'yes, yes it is, yes'. The quote is from the letters as collected and edited b Richard Ellmann.

Finnegans Wake is a work of comic prose by Irish writer James Joyce that is significant for its experimental style and resulting reputation as one of the most difficult works of fiction in the English language....
- Wikipedia

Finnegans Wake represents the summit of twentieth-century literary production in the English language
- Danis Rose and John O'Hanlon

Finnegans Wake is nowhere a work of fantasy or caprice, least of all at its most fantastic and capricious.
- Michael Chabon

Finnegans Wake is a novel written using the dream form as a device to tell the universal story of Everyman, Humprey Chimpden Earwicker, his wife Anna Livia Plurabelle and their children, twins Shem and Shaun and sister Isabel.
- The James Joyce Centre, Dublin

Finnegans Wake is very much, for me, [Joyce's] European book.
- Olwen Fouére

Finnegans Wake is not an interpretation of Vico, and Vico is not much of a key to the difficulties of Finnegans Wake. What Joyce found in Vico was what every novelist needs when planning a long hook-a scaffolding, a backbone.
- Anthony Burgess

Finnegans Wake is wilfully obscure. It was conceived as obscurity, it was executed as obscurity, it is about obscurity
- Adeline Glasheen

It is night. It is dark. You can hardly see. You sense rather

- James Joyce ( letter to Jacques Mercanton, 1940) [Mercanton (1910- 1996) was admirer of Finnegans Wake, living in Lausanne, whom Joyce hoped would play the exegetical part in relation to the Wake that Stuart Gilbert had earlier played in relation to Ulysses.]

Finnegans Wake is for me just a thing it is more fun to think about than most other things.

- Adeline Glasheen

Finnegan's Wake addicts are a curious brand of cats: they think everybody else is a benighted flounderer and that they - each one - hold the answer

- Thornton Wilder

Finnegans Wake is set in Chapelizod, the hamlet which Mr Duffy of 'A Painful Case' considered to be as far away as he could get from Dublin while still considering himself a citizen, the neighbourhood besides which all others were 'mean,modern and pretentious'. Visiting there, you can see what he liked about the place.

Finnegans Wake is the story of James Joyce and Nora Barnacle, superimposed upon the story of Joyce's father and mother, John Joyce and Mary Jane Murray, and upon the story of their parents, and theirs, and so on, through HCE and ALP to Adam and Eve and beyond, in cycle after cycle continually changing and eternally the same